VWR Black Rubber Stoppers, One-Hole - Size 4 - Model 59581-221 - Case of 5 : These black, high percentage rubber stoppers are low in free sulfur and have a single hole to facilitate laboratory procedures. Stoppers sized as 000 through 0 have a 3mm diameter hole; the size 1 stopper has a 4mm hole. Stoppers sized as 2 and larger have a 5mm diameter hole. Remain resilient and pliable under most laboratory conditions.

Condition: New Shipping Weight: 6lb

This item will be shipped from the manufacturer and is not one we carry in stock. Please contact us for availability, as we cannot always guarantee order fulfillment.